#include <SoftwareSerial.h> 
   SoftwareSerial Bluetooth(10,11); 
    
   const int ileri = 12; 
   const int ileri2 = 7; 
   const int geri = 13; 
   const int geri2 = 5; 
    
   char bilgi; 
    
    
   void setup() 
   { 
     Bluetooth.begin(9600); 
     pinMode(ileri, OUTPUT); 
     pinMode(geri, OUTPUT); 
     pinMode(ileri2,OUTPUT); 
     pinMode(geri2,OUTPUT); 
   }   
    
   void loop() 
   { 
     while(Bluetooth.available()) 
      { 
        bilgi=Bluetooth.read(); 
        if(bilgi=='a') 
        { 
          digitalWrite(ileri, LOW); 
          digitalWrite(ileri2,HIGH); 
          digitalWrite(geri, HIGH);  
          digitalWrite(geri2,LOW); 
        } 
        else if(bilgi=='s') 
        { 
          digitalWrite(ileri, LOW); 
          digitalWrite(ileri2,LOW); 
          digitalWrite(geri, LOW);  
          digitalWrite(geri2,HIGH);  
        } 
        else if(bilgi=='d') 
        { 
          digitalWrite(ileri, LOW); 
          digitalWrite(ileri2,LOW); 
          digitalWrite(geri, LOW);  
          digitalWrite(geri2,LOW);    
        } 
        else if(bilgi=='h') 
        { 
          digitalWrite(ileri, HIGH); 
          digitalWrite(ileri2,LOW); 
          digitalWrite(geri, LOW);  
          digitalWrite(geri2,LOW);  
        } 
        else if(bilgi=='g') 
        { 
          digitalWrite(ileri,HIGH); 
          digitalWrite(ileri2,LOW); 
          digitalWrite(geri, LOW);  
          digitalWrite(geri2,HIGH); 
        } 
      } 
   }  

using System; 
   using System.Collections.Generic; 
   using System.ComponentModel; 
   using System.Data; 
   using System.Drawing; 
   using System.Linq; 
   using System.Text; 
   using System.Threading.Tasks; 
   using System.Windows.Forms; 
   using System.IO.Ports; 
    
   namespace WindowsFormsApplication10 
   { 
       public partial class Form1 : Form 
       { 
           SerialPort serialport; 
           public Form1() 
           { 
               InitializeComponent(); 
               serialport = new SerialPort(); 
               serialport.BaudRate = 9600; 
           } 
    
           private void button1_Click(object sender, EventArgs e) 
           { 
               try 
               { 
                   serialport.PortName = textBox1.Text; 
                   if (!serialport.IsOpen) 
                       serialport.Open(); 
                   label3.Text = "Bağlandı!"; 
               } 
               catch 
               { 
                   label3.Text = "Seri Port Hatası!"; 
               } 
           } 
    
           private void button2_Click(object sender, EventArgs e) 
           { 
               serialport.Close(); 
               label3.Text = "Serial Port Kapatıldı!"; 
           } 
    
           private void button3_MouseDown(object sender, MouseEventArgs e) 
           { 
               serialport.Write("g"); 
           } 
    
           private void button3_MouseUp(object sender, MouseEventArgs e) 
           { 
               serialport.Write("d"); 
           } 
    
           private void button4_MouseDown(object sender, MouseEventArgs e) 
           { 
               serialport.Write("h"); 
           } 
    
           private void button4_MouseUp(object sender, MouseEventArgs e) 
           { 
               serialport.Write("d"); 
           } 
    
           private void button6_MouseDown(object sender, MouseEventArgs e) 
           { 
               serialport.Write("s"); 
           } 
    
           private void button6_MouseUp(object sender, MouseEventArgs e) 
           { 
               serialport.Write("d"); 
           } 
    
           private void button5_MouseDown(object sender, MouseEventArgs e) 
           { 
               serialport.Write("a"); 
           } 
    
           private void button5_MouseUp(object sender, MouseEventArgs e) 
           { 
               serialport.Write("d"); 
           } 
    
           private void button3_Click(object sender, EventArgs e) 
           { 
    
           } 
       } 
   }